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DMRS sequence determining method, terminal, and network side device

A network-side device and a technology for determining a method, which is applied in the field of communication, can solve problems such as poor accuracy of DMRS sequences, and achieve the effect of improving accuracy

Active Publication Date: 2018-11-13
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for determining a DMRS sequence, a terminal and a network side device to solve the problem of poor accuracy in distinguishing the DMRS sequences used for self-demodulation

Method used

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  • DMRS sequence determining method, terminal, and network side device
  • DMRS sequence determining method, terminal, and network side device
  • DMRS sequence determining method, terminal, and network side device

Examples

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example 1

[0125] Example 1: Assume that a REG consists of 12 consecutive REs on one OFDM symbol, and each REG contains 4 AP REs of one antenna port. When the network side device pairs multiple terminals together for MU-MIMO transmission, the DMRS sequences used by different terminals use different OCC sequences for scrambling. When scrambling the DMRS sequence, the REGgroup is used as the unit. In this embodiment, it is assumed that a REG group includes only one REG. The type of the OCC sequence may be frequency-domain OCC, time-domain OCC or time-frequency domain OCC. Taking the above assumption as an example, when frequency-domain OCC is used, the length of the OCC sequence is 4, so there are at most 4 OCC sequences. If time-domain OCC is used, and there are two REGs in the time domain for time-domain OCC, the length of the OCC sequence is 2 and there are at most 2 mutually orthogonal OCC sequences; if the OCC sequence is added to the DMRS sequence in the time-frequency domain inte...

example 2

[0127] Example 2: Assume that a REG consists of 12 consecutive REs on one OFDM symbol, and each REG contains 4 AP REs of one antenna port. When the network side device pairs multiple terminals together for MU-MIMO transmission, the DMRS sequences used by different terminals use different OCC sequences for scrambling. When scrambling the DMRS sequence, the REGgroup is used as the unit. In this embodiment, it is assumed that one REG group includes only 2 REGs. Since one REG group contains 8 DMRS REs, the length of the OCC sequence is 8, and there are at most 8 mutually orthogonal OCC sequences. An example of frequency-domain OCC is Figure 7 shown. In addition, when using the OCC sequence to scramble the DMRS, the time domain may be followed by the frequency domain, or the frequency domain may be followed by the time domain. Further, in this embodiment of the present invention, no limitation is imposed on the size of the REG group.

example 3

[0128]Example 3: Assume that a REG consists of 12 consecutive subcarriers on an OFDM symbol, and each REG contains 4 REs of an antenna port. When multiple terminals perform MU-MIMO transmission, DMRSs of different terminals are transmitted on the same port. During specific transmission, DMRSs corresponding to different terminals are transmitted on different REGs. For example, assume that the downlink control channel resource set includes 3 OFDM symbols in the time domain and includes 6 REGs. And it is assumed that two terminals are paired for MU-MIMO transmission. The six REGs are sequentially numbered {0 1 2 3 4 5}. According to its own UE ID, the number of UEs transmitted by the pair, the number of REGs in the control channel resource set, etc., the terminal determines which REGs its DMRS is transmitted in. Specifically, for example, the formula REG index=mod(mod(UE ID+O,N),M), where O=0,2,4. For example, N=2, M=6, UE ID1=0, UE ID2=1, UE1 determines that its correspondin...

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Abstract

The invention provides a DMRS sequence determining method, a terminal, and a network side device. The method comprises: the terminal acquires a DMRS sequence receiving parameter associated with the terminal; and the terminal acquires the DMRS sequence corresponding to the DMRS sequence receiving parameter sent by the network side device. The embodiments of the invention may improve the accuracy ofdistinguishing the DMRS sequences used for self-demodulation.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular to a method for determining a demodulation reference signal (Demodulation Reference Signal, DMRS) sequence, a terminal and a network side device. Background technique [0002] In Long Term Evolution (LTE), Multi-User Multiple-Input Multiple-Output (MU-MIMO) technology can be applied to Enhanced Physical Downlink Control Channel (EPDCCH) ). When the EPDCCH is transmitted using MU-MIMO, different terminals distinguish the DMRS sequences required for their own demodulation according to different antenna ports (antenna ports) used for DMRS transmission. However, in the future wireless mobile communication system, the structural design of the downlink control channel may be different from that of the EPDCCH, so that the terminal distinguishes the DMRS sequence used for its own demodulation according to the different antenna ports (antenna ports) used for DMRS transm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L25/03H04W72/04
CPCH04L5/0008H04L5/0048H04L25/03866H04W72/0453
Inventor 王磊李辉
Owner DATANG MOBILE COMM EQUIP CO LTD